{"product_id":"er-comp-catless-dp-s55","title":"ER Competition Series Catless Downpipes — S55","description":"\u003cp\u003e\u003cstrong\u003eEvolution Racewerks Competition Series twin downpipes for the S55 — F80 M3, F82 M4, F83 M4 Convertible, F87 M2 Competition.\u003c\/strong\u003e Twin 3.5\" mandrel-bent T304 stainless pipes — one per turbo. The largest downpipe section in ER's catalog for a reason: the S55 makes meaningful exhaust flow that the OEM downpipes deliberately restrict for noise compliance.\u003c\/p\u003e\n\n\u003ch3\u003eThe S55 and downpipes\u003c\/h3\u003e\n\u003cp\u003eThe OEM S55 downpipes are restrictive enough that even un-tuned M3\/M4 owners commonly report a meaningful difference from a downpipe alone. On Stage 2 and Stage 3 builds, OEM downpipes become the single biggest exhaust restriction — replacing them is standard for any serious F8X tune.\u003c\/p\u003e\n\n\u003ch3\u003eFor the F87 M2 Competition specifically\u003c\/h3\u003e\n\u003cp\u003eSame engine as the M3\/M4 but in a smaller chassis with slightly different exhaust routing. These downpipes drop post-turbo back-pressure to the level the S55's wastegate strategy expects, sharpening throttle response across the rev range.\u003c\/p\u003e\n\n\u003ch3\u003eCatless vs Catted\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCatless:\u003c\/strong\u003e race-only, twin 3.5\" pipes, no cat material. CEL on stock cal — Esse Werks Stage 2\/3 calibrations clear it. Standard choice for track-driven F8X builds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Flow Catted:\u003c\/strong\u003e 200-cell metallic cats in both pipes. CEL-clean on stock cal. Community-observed flow sits close to the catless pipes for street and most track use.\u003c\/p\u003e\n\n\u003ch3\u003eWhat Evolution Racewerks builds in\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e100% 304-grade stainless steel construction\u003c\/li\u003e\n  \u003cli\u003eMandrel-bent piping — smooth transitions, no flow restrictions at the bends\u003c\/li\u003e\n  \u003cli\u003e100% TIG-welded by ER's in-house fabricators\u003c\/li\u003e\n  \u003cli\u003ePrecision CNC-machined flanges (billet 304 stainless)\u003c\/li\u003e\n  \u003cli\u003eMade in the USA — manufactured in-house at ER's California facility\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLimited Lifetime Warranty\u003c\/strong\u003e against manufacturing defects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eEGT bung included — standard on every Esse Werks ER order\u003c\/h3\u003e\n\u003cp\u003eEvolution Racewerks offers the EGT (Exhaust Gas Temperature) sensor bung as an optional add-on on their direct catalog. \u003cstrong\u003eWe include it on every ER downpipe \/ mid pipe we ship — no upcharge.\u003c\/strong\u003e Comes pre-installed with a 1\/8\" NPT plug so you don't need to run the EGT sensor immediately. When you're ready to add EGT monitoring to your build (recommended at Stage 2 and above for any sustained-load driving), the bung is already there.\u003c\/p\u003e\n\n\u003ch3\u003eSwainTech White Lightning — our signature coating\u003c\/h3\u003e\n\u003cp\u003eWhen we coat a part, we use one coating: SwainTech White Lightning — a true ceramic thermal barrier applied about 0.015\" thick (versus roughly 0.002\" for paint-style \"ceramic\" finishes) and sprayed molten so it bonds to the metal instead of sitting on top. It cuts radiant heat off the exhaust by roughly 35–55%, dropping underhood and intake temperatures, and keeps heat inside the pipe where it sustains exhaust velocity and scavenging. And it's white — a deliberate signature in a market that otherwise all looks the same in black. Select it above.\u003c\/p\u003e\n\n\u003ch3\u003eCalifornia restriction\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eThis product is not for sale, installation, or use on licensed vehicles in the State of California.\u003c\/strong\u003e 49-state product. Vehicle Compliance Waiver signed at order intake. International orders ship without restriction.\u003c\/p\u003e\n\n\u003ch3\u003eInstall\u003c\/h3\u003e\n\u003cp\u003e~3-4 hours at a competent shop. Reuses OEM hardware where applicable. Includes all hardware for complete installation.\u003c\/p\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eS55 twin-turbo applications — F80 M3, F82 M4, F83 M4 Convertible, F87 M2 Competition (2018-2021).\u003c\/p\u003e\n\u003cp\u003eThis part is the downpipe-side Core of every S55 Stage 2 build. The \u003ca href=\"\/products\/stage-2-kit-s55\"\u003eStage 2 Kit — S55\u003c\/a\u003e packages the matched parts + calibration for 8% under à la carte.\u003c\/p\u003e","brand":"Evolution Racewerks","offers":[{"title":"Catless — Brush Finish","offer_id":43280681861181,"sku":"EW-EXH-ER-S55-CATLESS","price":1415.0,"currency_code":"USD","in_stock":true},{"title":"Catless — SwainTech White Lightning","offer_id":43280681893949,"sku":"EW-EXH-ER-S55-CATLESS-CER","price":1665.0,"currency_code":"USD","in_stock":true},{"title":"High-Flow Catted — Brush Finish","offer_id":43280681926717,"sku":"EW-EXH-ER-S55-CAT","price":1765.0,"currency_code":"USD","in_stock":true},{"title":"High-Flow Catted — SwainTech White Lightning","offer_id":43280681959485,"sku":"EW-EXH-ER-S55-CAT-CER","price":2015.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/2553\/8109\/files\/ER__competition-series-catless-downpipes-2015-20-m2-competition-m3-m4-s55-engine_01.webp?v=1781743119","url":"https:\/\/essewerks.com\/products\/er-comp-catless-dp-s55","provider":"Esse Werks","version":"1.0","type":"link"}